Import CSV to Jira Asset and mapping object

[백재현_백엔드인프라]

My CSV Header is below

StudentId, Name, School, Class

And my asset project already has school and class object.

My requirement is here

1. I want to import this multiple time with overwrite. But everytime I import csv, every Students are imported multiple times. As you see, StudentId is a unique key. How do I overwrite using StudentId?

2. How do I make a reference School and Class?

I already tried to write AQL objecttype=${School} but it doesn't work.

Please let me know